.background::before {
    /* ... 之前的全局样式 ... */
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /*background: url('../assets/login-back.jpg') repeat;*/
    z-index: -1;
    pointer-events: none;
    opacity: 0.2;
}

.background::after {
    content: '';
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px; /* 调整图形大小 */
    height: 200px;
    background-color: transparent;
    z-index: -1;
    pointer-events: none;
}

/* 绘制圆圈 */
.background::after::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px; /* 调整圆圈大小 */
    height: 50px;
    background-color: #f00; /* 调整颜色 */
    border-radius: 50%; /* 使其成为圆形 */
}

/* 绘制箭头 */
.background::after::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg); /* 旋转45度，形成箭头 */
    width: 20px; /* 调整箭头大小 */
    height: 20px;
    border-top: 2px solid #00f; /* 调整颜色和线条粗细 */
    border-right: 2px solid #00f;
}